/Engine/Plugins/Developer/Concert/ConcertUI/ConcertSharedSlate/Source/ConcertSharedSlate/Public/Session/Activity/SConcertSessionActivities.h
If bound, invoked when an item in the table is right-click and we are supposed to show a menu of actions.
WidgetArgsType & OnContextMenuOpening &40; const FOnContextMenuOpening & InDelegate &41;